I assumed he was talking about the Historical jacket.
The difference in the leather is difficult to see in pictures
Here is the pre-2009 version:
...but the colour is off... it's really more of a dark brown, or a brownish-black. Here is a close-up:
...and here is the 2009+ version:
...but the colour is a little off in this pic, too; the 2009+ jacket is more of a true black.
The grain in the 2009+ jacket can be seen here:
Besides the difference in the leather itself, the 2009+ has a small patch celebrating the 2007 MotoGP championship on the back near the top, and there are a couple of extra leather panels/seams on the front of the jacket prior to 2009, and the lether panels on the back are are little different.